chapter7_5.m

《MATLAB在控制系统中的应用》实例程序

ng0=[1];dg0=conv([1,0],conv([0.001,1],[0.1,1])); 
g0=tf(ng0,dg0);t=[0:0.001:0.07];w=logspace(0,4); 
KK=1000;Pm=45;wc=165; 
[ngc,dgc]=lead5(ng0,dg0,KK,Pm,wc,w); 
gc=tf(ngc,dgc),g0c=tf(KK*g0*gc); 
b1=feedback(KK*g0,1); b2=feedback(g0c,1); 
step(b1,t), grid on,hold on, step(b2,t);hold off 
figure,bode(KK*g0,w), grid on,hold on,bode(g0c,w),hold off 
[gm,pm,wcg,wcp]=margin(g0c),Km=20*log10(gm)